FLANGES Flexible Systems Products also manufacture marman flange that range from 2  to 6 inches in diameter. Flanges are most often used to connect pipes that have a diameter greater than 2 inches. A flange joint consists of two matching disks of metal separated by a gasket that are bolted together to achieve a strong seal with the gasket material. The flange is attached to the pipe by welding, brazing, or screwed fittings. Material that is used to make these products is T-304 Stainless Steel and Carbon Steel. © 2010 Flexible Systems Products ALL RIGHTS RESERVED